Receiving circuit



Aug. 12, 1930. s. JONES 'RECEIVING cRcUI'r Filedreb. 26, 1925 Patented Aug. l2, 1930k PATENT oFFrcEV SAMUEL `SEAIMLAIN'"JONES, BROOKLYN, YORK, ASSIGNOR T0 KELLOGGYSWITCH-U j BOARD AND SUPPLY'COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS` Vaneiarvrirefcancun Y j if ppncafioaledfebruari*26, lega semaine. 621,126.

invention'has to do Withsystems us`` `ing high freque'r'icyl oscillatory currents for signaling, purposes and: is directed to a certain improvedarrangement for the intensifi- 5V cation of Wealrsignalsy and 'for accurateftuning of the circuits fand'instrumentalities employed. In the accompanying diagram, VI

have illustrated the "inventionv as embodied in Y a preferred form of'signal receiving circuit p although it is not limited to receiving pur` poses only. The system as shown,'may be employedfor short-Wave reception in which case the tubeA is used asl the detector, orthe system may be used for long Wave reception l5'` by Which l mean reception of waves `from say 10,000 meters up in which case the rheostat for tube A is turned down and the tube B is used as `the detector tube for the long Waves. l A

Referring now to the drawing'the system there illustrated for receiving purposes has in series With antenna 1 the usual tuning'com denser 2 vandthe primary 3 of the usual variocoupler with'taps connected to contacts 7. vwith which contacts is associated the rotary switchlever 8. connected toground. The sec ondary 4 of thevariocoupler is rotatably supa ported with reference to the primaryf3 so that the closeness of the coupling` between 3 30 andl may bevariedas desi-red.`-` Between condenser 2 and primary 3, atap having connected in` it ythe grid condenser 6 and associated' grid leak, leads to the grid'of detector tube,

lA Whose plate connect-s with secondary l and 1775, the primary `,of transformer 9 andthence to plate battery 13;` the Whole forming ywhat is Y often referred to asaregenerative feed-back VVLZcircuit. The *filamentof detector ktube A is connected to the storage battery K12, through tery 12 is used to heat vthe filaments ofthe amplifier tubes B, C, and D, eachof saidlatl ter tubes having its rheostat R. Bridged Vfrom the antenna to the plate, is the variable inductance or variometer 5 and this is a most o condenser`2 and the levert` associated with f rheostat R in the'usual Way,V and the same baty ti oningandthe oscillations from* antenna 1 ventedil from"g `bein gf rectified; due'l`r to the con-1` varioooupler primary 3 are adjusted to brin inthe signals and thensecondary 4 andfvariometer ar'e adjusted to control the' sharpness of tuningr and the volume of reception,^con denser l2b`eing alsoy adjusted as necessary'in the operation.l i l Y f 1` The'incoming signals when tuning is prop-j erly made, are effective upon the grid of tube Atovary the electron flow between plate and filament in the usual manner andthe plate 60 potential variations are brought jbackto'fthe'v grid by the feed-baclrcoil 4 which serves to impress said variations upon the grid of tube A byvvay of primary 3 and condenser 6; The variometer being connectedto theplate of tube A serves to accurately tunethe plate variations and bring them into resonance with the impressed oscillationsl so `that electrov static regeneration Yis eiective upon the grid from the plate of tube LA by t,thefag'gency of condenser2. At the same time a second path is provided" for the "oscillations impressed uponV the antenna 1 This'path maybe traced through variorneter `5, the plate 'of tube and n thence to thefilament of tubeAglThisffaru" rangement 'provides' supplelnentaryv2 means' frfrectifyi'ngr the' oscillatory currents "imi messed-abbatteantenna and adds tp the ein: ciency ofjthesystern as a `Whol'eas Well 'as l sharing in the' regenerative process 'off the pla s' of the Avarious' tubes.`

through4 the filament 'of the*tubeiitwilli'be .rendered inoperativeas to its normalfunc of suchjrelatively lovv lengtlisfas .to normally i com Withinthfe4 vscope offthetuning'agencles associajt`ed"'vvit h` tube "are, ii'course,""prefy son roor d in the telephonic receiving instrument 16. By means of the tap from antenna l which leads through the variometer 5, the oscillations impressed on the antenna have a path which leads them direct tothe step-up transformer circuits. Theprimary and secondary windings of suchltransformergbeing of the usual types are effective now as tight coupled tuning inductances and on account ofthe very large numberoturnsgused .in amplifyingl transformers the length of wave `for which the system is adapted to be tuned is enormously increased. vThe tuning circuit in such -a case comprises the variometer, thesecondary 4 and the primary and secondary windings-ofthe transformer 9. Usingl a wel-l known `typelof audio frequency amplifying` transformer and by properly adjusting the tuning condenser 2in the antenna leadfany of the ,principal -long wave length stationsmay be readilv heard, such, for example, as Carnarvon, Wales; Nauen, Germany; Nantes. Eranee; Annapolis, Md.. etc.

With `the tube A rhaving` its rheostat adusted so that .nocurrent flows in the filament Vandf'with ythe tuning means just describedthe tube B servesas ,the detector tube andthetubes Grand D serve as amplifiers for the-signalsreceived on -waves of from ten to twentyfthousandmeters.

In-themppendedclaims, I desire not rto be limitedto the precise arrangements andfuses shown' andA described as-,the :invention `maybe employed -in various relations, `but what I do claim yand desire to, protect yby Letters Patent ofi the United yStates is Avacuum--tube wireless .system includingan audion .tubcfan antenna, means for tuning said antennainclu dingy avari able con denserand a variable inductance, a `grid-element orfsaidf tube eonductively connectedy between said Variable condenser and said varif able inductance toftheentenna circuit, a plate kelement for said-tube conductivelv connected tolsad antenna and receiving abortion of the impressed oscillations independently y of said grid, a Ytuning device in 'said fantenna plate circuit rforwssistingrin the .resonatinxz of. the

receiving circuit tofthe incomingI oscillations,

i and a windingvin the platecathode circuit in -midvvariable indueta'nce,v av plate for.y said en -1 didnft'ube conductively connected to ysaid antenmgawariablefinductance insaidfplate antenne. crrcuit,-a reproducing device :coupled tofthefplnte cathodecircuit, and a winding in xdipletm cathode circuit mounted firnfindnckosci lation receivermrcuit for tuning urposes, abranch plate circuit extending om saidplate to the cathode of said audion tube and .a .feed-back lwinding `connected in said branch circuit'inductively related to the va.- riableinductance inthe antenna circuit for sustaining impressed oscillations. y

Sligned byme at New York in the county of ew Yorkand Stateof New York, this th day `of February, 1923.

' y `SAMUEL SEAMAN JONES. 

